Hi, I keep getting the following errors from ZPatterns: Error Type: AttributeError Error Value: _v_cache Traceback (innermost last): (Object: LockableItem) File /usr/local/zope/2.4.0_base/lib/python/ZPublisher/Publish.py, line 162, in publish File /usr/local/zope/2.4.0_base/lib/python/ZPublisher/BaseRequest.py, line 447, in traverse File Products/LoginManager/LoginManager.py, line 252, in validate (Object: ProviderContainer) File Products/LoginManager/LoginMethods.py, line 105, in findLogin (Object: PlugInBase) File Products/LoginManager/LoginManager.py, line 209, in getItem (Object: ProviderContainer) File Products/ZPatterns/Rack.py, line 56, in getItem (Object: ProviderContainer) File Products/ZPatterns/Rack.py, line 259, in _fromCache (Object: ProviderContainer) AttributeError: (see above) This is: Zope 2.4.0 ZedPatterns-0-4-3p2-transactionagents LoginManager-0-8-8b1 (Steve A's special hacked version) Any ideas? I don't really understand, 'cos _v_cache is a computed _class_ attribute: _v_cache = ComputedAttribute(_v_cache) I wonder if this line could have an effect: __per_transaction_cache_attrs__ = ('_v_cache',) Any help would be very much appreciated... cheers, Chris